Re: [FFmpeg-devel] [PATCH] avcodec/truemotion2: Fix integer overflow in TM2_RECALC_BLOCK()

[Michael Niedermayer]

On Sat, Jan 20, 2018 at 04:50:29AM +0100, Michael Niedermayer wrote:
> Fixes: signed integer overflow: 1477974040 - -1877995504 cannot be 
> represented in type 'int'
> Fixes: 4861/clusterfuzz-testcase-minimized-4570316383715328
> 
> Found-by: continuous fuzzing process 
> https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
> Signed-off-by: Michael Niedermayer 
> ---
>  libavcodec/truemotion2.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)

applied

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[FFmpeg-devel] [PATCH] avcodec/truemotion2: Fix integer overflow in TM2_RECALC_BLOCK()

[Michael Niedermayer]

Fixes: signed integer overflow: 1477974040 - -1877995504 cannot be represented 
in type 'int'
Fixes: 4861/clusterfuzz-testcase-minimized-4570316383715328

Found-by: continuous fuzzing process 
https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer 
---
 libavcodec/truemotion2.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/libavcodec/truemotion2.c b/libavcodec/truemotion2.c
index f077f0e4bd..97c38f7f08 100644
--- a/libavcodec/truemotion2.c
+++ b/libavcodec/truemotion2.c
@@ -441,8 +441,8 @@ static inline int GET_TOK(TM2Context *ctx,int type)
 
 /* recalculate last and delta values for next blocks */
 #define TM2_RECALC_BLOCK(CHR, stride, last, CD) {\
-CD[0] = CHR[1] - last[1];\
-CD[1] = (int)CHR[stride + 1] - (int)CHR[1];\
+CD[0] = (unsigned)CHR[ 1] - (unsigned)last[1];\
+CD[1] = (unsigned)CHR[stride + 1] - (unsigned) CHR[1];\
 last[0] = (int)CHR[stride + 0];\
 last[1] = (int)CHR[stride + 1];}
 
-- 
2.15.1

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